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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5db888a70d54cee491ad8fe1b07fa6a1198123975587e3ca441d0d1307eb3bb5' 
  AND token = 'GKeYroaDLm9jQgubU0unEhYW5XuIAqPXAdEB92lf9uM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}